Revert of Modifications to layout test framework so that it can work with browser_tests.

Tools/Scripts/webkitpy/layout_tests/port/driver_unittest.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 202 matching lines @@
     def test_creating_a_port_does_not_write_to_the_filesystem(self):
         port = TestWebKitPort()
         driver = Driver(port, 0, pixel_tests=True)
         self.assertEqual(port._filesystem.written_files, {})
         self.assertEqual(port._filesystem.last_tmpdir, None)
 
     def test_stop_cleans_up_properly(self):
         port = TestWebKitPort()
         port._server_process_constructor = MockServerProcess
         driver = Driver(port, 0, pixel_tests=True)
-        driver.start(True, [], None)
+        driver.start(True, [])
         last_tmpdir = port._filesystem.last_tmpdir
         self.assertNotEquals(last_tmpdir, None)
         driver.stop()
         self.assertFalse(port._filesystem.isdir(last_tmpdir))
 
     def test_two_starts_cleans_up_properly(self):
         port = TestWebKitPort()
         port._server_process_constructor = MockServerProcess
         driver = Driver(port, 0, pixel_tests=True)
-        driver.start(True, [], None)
+        driver.start(True, [])
         last_tmpdir = port._filesystem.last_tmpdir
         driver._start(True, [])
         self.assertFalse(port._filesystem.isdir(last_tmpdir))
 
     def test_start_actually_starts(self):
         port = TestWebKitPort()
         port._server_process_constructor = MockServerProcess
         driver = Driver(port, 0, pixel_tests=True)
-        driver.start(True, [], None)
+        driver.start(True, [])
         self.assertTrue(driver._server_process.started)